Obzip.dll not found errors

I have just purchased an ObjectDesktop subscription and am having difficulty running a number of the applications. They won't open but return an error stating that they can't find obzip.dll in either the Common Files/Stardock folder or in the ObjectDesktop/xxx folder. I have confirmed that these files are in fact present. Further, I have tried this with objectzip installed and uninstalled and, when installed, set as the default zip file handler. I have also tried uninstalling/reinstalling the apps affected via Stardock Central. The problem persists. I have both Stuffit Deluxe 9.1 (set to handle .sit files only) and WinRar 3.51 (set to handle everything but jar files). Any thoughts as to what is going on? This is really annoying as I can't seem to use either Theme Manager or DesktopX and I'd really like to! [EDIT]: should mention that I have also tried installing the latest full releases and the latest betas to see if the behaviour changes -it doesn't. Also, this is on a first generation Centrino notebook running Win XP Pro Sp-2 with all updates and with 1GB RAM. Also running WB5 with per-pixel blending enabled.