Hi Jeff, I also wasn't able to reproduce this problem. There is probably a real problem but some step that causes it is missing. If you figure out that step let me know. Tom Jeff wrote:

sorry about the confusion,

what I meant by 'does not work', is that once I have loaded the volume planes tool, it appears to not allow me to select 'update display without pressing show'. (the button is depressed in the dialog box, or i unclick/reclick it, but it no longer toggles 'update....w/o press show' on and off). 2318 build.

sequence:

1) load map; display with solid rendering. default is 'update w/o press show', and you can see the effect of playing with histogram update in realtime.

2) start volume planes. now requires me to press 'show' to update the display. this also includes other volumes that vol planes is not used on, and 'update w/o show' no longer works in surface or solid mode.

3) close volume planes, or close session. problem persists.

4) restart chimera, now it allows 'update..w/o press show' again.

so, this happened to me twice, and i figured it was just something to do with the volume planes tool. As I am writing this, I just re-did the sequence above, and now it works (volume plane tool updates, can switch to surface). Because I can no longer replicate this, I should probably be ignored. Also, I just loaded one of the sessions I was having a problem with into a new launch of chimera, thinking there might be some sort of 'system/state snapshot' I could send you, but now it is working too. So, it appears to have been fixed by a restart of chimera. Again, please ignore.

-Jeff