Placing a filler in the world shows a black/purple squared block. With some debug text on top about placement. It does not look like a Filler and there is no gui that can be opened.

Buildcraft version: 7.99.12
Forge version: forge-14.23.0.2544

Singleplayer: yes

Additional information:
Buildcraft is the only mod loaded.

When placing landmarks first it does show gui. But still no proper texture on it.

Have you got some screenshots?

screenshot:

I am receiving a similar issue with Filler though Mine is a server Issue. When as a Client I try and log in I get errors and denied access :

[09:15:36] [main/WARN]: Texture buildcraftbuilders:textures/filler/parameters/face_west.png with size 0x0 will have visual artifacts at mip level 0, it can only support level -1. Please report to the mod author that the texture should be some multiple of 16x16.

there are 5 others of these face_down, face_east. face_up, face_north, face_south

latest.log

I tried turning off filler block and the item filler planner in hopes it might work but I still receive the error.

Unfortunately the "buildcraftbuilders:textures/filler/parameters/face_west.png" errors aren't related to the filler's block texture, but todo with one of the parameters for modifying the patten that is used for actually filling an area.

Also, wow, how have I not noticed this before... this is broken in dev as well, I have no idea why I thought it wasn't...

XD well glad we could point something out ! And already a dev fix sweet cannot wait to be able to try it been fighting for 20 hours thought it was something I did XD

For some reason I never thought to place it down in a test world... In theory you can temp-fix it by adding a resource pack with https://github.com/BuildCraft/BuildCraft/blob/8.0.x/buildcraft_resources/assets/buildcraftbuilders/blockstates/filler.json instead of the current version.

Ok I will attempt to figure out how to do that and see if I can get in ! thanks so much !

And truly there is so much to check and look out for somethings are easy to pass by I am sure.

Just wanted to say thank you again ! worked awesome once I was able to resolve what was keeping em out of the server and now I know how to make resource packs ! Great mod Thanks