Floor can't be changed??

[patricks]

I'm trying to adjust some edges of a floor slab, and whenever I try to delete a line in the sketch mode, it automatically says "Floor sketch is invalid", even though I'm still in sketch mode, and have not finished sketching. It looks to me like this floor slab has become un-changeable, as it will not let me delete any line from the entire sketch without giving me that error message. :banghead:

[Dimitri Harvalias]

Sometimes you can resolve slab problems like this by copying the slab to the clipboard and pasting it in the same place. Delete the old slab and try editing the new one.