I've searched through the KB and on the forums for this issue but it doesn't appear that others are affected by this. On occasional models the modify dimension box will suddenly refuse to appear. I've noticed it on and off for a couple of months.
I'll be happily working on a part (sometimes a new one, sometimes an older part, doing updates) and then seemingly randomly the modify dialog will refuse to appear, both when first dimensioning an entity, and when double clicking the dimension.
In some cases I have to do any dimension modifications in the property manager, which gets old really quickly! Other times (like now), I can open another part or assembly, open and close the modify dimension dialogue there and then go back to the affected part and everything is fine!
I did find SPR #394483, but that's just marked as closed.
Anyone got a clue what could cause this? I would upload the affected part but its started working again!
SolidWorks2011 64-bit on Vista btw.