Dear Tom,

thanks for your reply, but it didn't change anything; the problem remains.  Moving back to version 1.2509 of last May made it go away; but this is only a temporary solution. The graphics card is an ATI Radeon Mobility X1400.  Next step I guess will be to update the driver!  Any other suggestions?

James

Tom Goddard wrote:
Hi James,

 Chimera memory use has not changed significantly.  More likely your problems are due to graphics driver bugs.  You might try turning off multisampling (opengl optimization that smooths edges).  Use menu entry Tools / Viewing Controls / Effects and see if "multisampling" is on -- this depends on whether your graphics card supports it.  If it is on turn it off (false).  Use the Save button on the Effects tab if this solves your instability problems and then it will be off each time you start Chimera.

   Tom