Only a minor aesthetic thing:
Since the search button is now in the top right corner, there is a strange gap after the delete button.

Just for documentation:
"Flower Towers" is mainly a jumping level and one where I fiddled around until it worked in tumbler-rewrite and the stable branch. I've made a comparision picture from a certain (late) point in the level to give an impression of the differences between the two branches. Most of the level is done by this point and it's after having done 13 jumps.
Left is the stable 0.9.7 and right the tumbler-rewrite branch. I've put the picture in a zipfile to avoid spoilers but I don't think it is spoilery.

I didn't provide a replay for "Lazy Gypsy Bums" but the other 12 I've covered. I've repaired as well the failing Clam replay to "Lix Recycling Plant". Most of the replays should break with the stable branch.

After reading mobius' problems with copying the output from the cmd prompt:
That's one of the reasons why I want to use logfiles for building because I can copy the output (esp. error messages) conveniently from the text files.
Copying from cmd prompt seems convoluted and unintuitive for a Win user. (I know one method is: right click -> choose mark -> mark with mouse movement+ hold left click or with arrow keys+ hold Shift -> press Enter => now the marked text should be in copy buffer and can be pasted.)

Simon, how serious is it with the tumbler rewrite branch? Are there major changes expected? I could in advance make repaired replays for that branch.

Since I probably can't really care for ClamLix from February on:
If there are any physics changes that break replays, please don't only look if there is a solving replay at all but also that Clam's intended route (Clam's replays) gets a replay as well.
The levels where that is relevant are:

Arcane:
- "Beaten into shape"
- "Builders Without Borders"
- "Over and Under and Out"
- "Send in the Square Squad"
- "Turning the Screws"

Insane:
- "Dig This!"
- "Lix Recycling Plant"

Flingsane:
- "Lost?"
- "Polar Pop"

Outtakes:
- "Just drop in!"
For "Just drop in!" it would be nice if in case my alternative route would get a repaired replay as well since the route is significantly different/ a completely different way to solve the level.

I just looked at "Just drop in" because of potential new batter physics. And indeed Clam's intended replay seems to break but it doesn't seem because of the changed batter physics but because of the changed blocker physics.
I've attached a repaired replay.

Flopsy has uploaded two further videos:

Cunning 1+2
Cunning 3-5

The proof collection doesn't seem to be updated with the level swap.

Thanks, Simon, for your answer.

Spoiler

Re: Free blocker with walker assignment:
Yeah, of course I generally know that, I've played through hundreds of levels by now.
But funnily the question nevertheless somehow hits the point in the sense that I had actually not realized in that moment that I've walkers available and could use them that way.

Thanks for the feedback.

I've solved 8 further Lemforum levels and mainly post to ask if my solution to "Jack in the Box" is intended. This one looks quite peculiar.

Remarks to the 5 Daunting levels

"Backslash" led me at first in the wrong direction and that was the main difficulty of the level.
"Death or Glory": Thought a bit too complicated at first but it is a rather straightforward level.
"Jack in the Box": I used a very extreme case of synergy between blockers and builder. Had quite some skills left in the end.
"Lixes in Motion": Another level that seems to lead you in the wrong direction. It is a bit timing intensive but a very interesting little level.
"Railroad Plot": For quite some time I had the wrong approach. In the end I had 2 diggers left.

Remarks to the 2 Vicious levels

"Changing of the Guards": This level seemed to me impossible at the beginning. But in the end everything worked out perfectly.
"Dividing Three By Two": Here I thought too convoluted in the beginning.

Remarks to "The Mon0lith"

Even with the runner this level seems fiddly and a bit trial and error for the last part. I think I had brought me in a situation where the last part was impossible timingwise and had then to adjust my solution by rewinding quite a bit.

Just for reference I've attached a file where one can see how the duplication looks in verifier.txt. I used an instance of Lix where I haven't solved/checked this level, yet; so I got two checkmarks updated for the same level.
It seems as if the verifier sees it as two different levels due to the different directory name but nevertheless accesses the same level for verification. The same for the directory.

One other oddity:
If you have a replay with lower case "lovely" and one with upper case "Lovely" the amount of levels is duplicated, since it lists all levels with lower case and with upper case directory name and says then "of 80" instead "of 40".

I can fully understand your position.
The only thing I noticed is that the mass verifier now explicitly seems to say that the checkmark is updated, though it isn't.

verifier.txt:
Result,Replay filename,Level filename,Player,Saved,Required,Skills,Phyus
(OK),replays/test/letsblockandblow-Forestidia-2017-12-05-065956 - Kopie.txt,levels/single/lemforum/lovely/letsblockandblow.txt,Forestidia,19,19,2,388
[...]
Statistics from 1 replays:
    1x (OK): replay solves the pointed-to level.
1 checkmarks for player `Forestidia' updated.

Quote from: ccexplore on January 09, 2018, 05:15:00 AM
Ok, that make sense.  It was tripping me up a bit when pressing ESC is described as "haven't finished the level properly", since a good number of players do use that to finish levels in lieu of wasting more time with a nuke.

Okay, sorry, I didn't know that. Thanks for the clarification.
I personally have just the intuition that in a game a level is only properly solved if you get the ending screen or at least the game finishes, that you have some kind of endpoint.
It furthermore feels just like a proof that is just missing one trivial step and is therefore not valid. Proofs are usually finite entities and the replay then just isn't.
But I can fully accept that it is seen otherwise. It's just my personal feeling about it. That's why I suspected that it is rather a non-issue.