invisible objects

hi,
i am having strange results, when using
tblojname and entmod-ing dxf 62 and 70 to mauupulate
layer visibility, it is rendering some objects, at random, (i think)
invisible, i am forced to use something like...

(setq alo (vla-get-activelayout
(vla-get-ActiveDocument
(vlax-get-acad-object))))
(vlax-for itm
(vla-get-block alo)
(vla-update itm))

to refresh the objects, but it is too slow,
this only started to be problem after A2k2,
anybody else experiencing similar problems??

actually i checked, even using the standard layer command
extensively, to freeze/thaw layers, is giving similar starge results.

mark

 

A few possiblities I would check (in this order):

Video refresh lag due to low system resources?
Corrupted drawing?
Display driver corruption or incompatibility with A2K2?
Video card hardware problem?(rare, but it has to start sometime...)