Editing dimensions extremely slow

V7, latest SP
For some time I am having troubles editing dimensions but today Rhino was completely stuck making fan spinning like crazy.

Hi Piotr - does it make any difference if you use the Properties page to edit, or completely close the Properties page and edit by double-click on the dimension? Does it matter what dimension style is involved?

-Pascal

Hi Pascal
Editing individual dimensions via property panel is smooth, no problem at all.
Editing custom dimension style is, at least, twice as slow as the default one ad I am talking about seconds before I can see any response from the panel (length factor).