I just purchased jv16 PowerTools 2006 a couple days ago and therefore have 336. I too have this problem; the "Working" dialog appears for a few seconds and then the Software Mgr window, with no entries at all.
Is there a place I can get 335 to try?
OK I just put it on another PC I have (I think I have 5 licenses) and it works on that one, a 450MHz P3 w/256Mb RAM and XP SP2.
The non-working machine is a 3.2GHz P4 Northwood HT w/1Gb RAM and XP SP2 as well.
If you have any suggestions for me to try pls post. I will hunt around the Registry for differences between these two PCs.
EDIT: OK I uninstalled completely and then went thru the Registry deleting any residual references there using 'jv16' as a search term. There were a few (I'd had older demos installed in the past). After re-installing from scratch, I still have the problem. :(