Ran into this problem when making mods to ForestFire.
I simplified the issue and re-created the problem as follows:
1) Open a new project
2) "make a block" ("for this class only ...")
3) Save the project
4) Try and re-open the saved project
Note: The error does NOT occur if you create a block "for all objects ..."
(Read-only) To re-open a bug, start a new thread in the Bugs forum.
2 posts • Page 1 of 1
See fixed in V51 :)