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?


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).