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well i use LP and pure messenger widget and pure calender widget a long with beautiful widgets weather clock, and i have no problems. so i think its possible that its the weather clock you are using causing the trouble. First I would uninstall and reinstall LP if that doesn't fix the problem try running with the weather clock uninstalled. If that still doesn't work try adjusting the memory usage settings in LP preferences, this can help with stability issues.

try adjusting memory usage in the preferences as well as a few other settings as some may cause instability, for example the 3d app drawer is still experimental and could cause issues thought that setting works fine for me so that shouldn't be a problem. Just go through the settings and check things out. After that i would post your issue to the developer's bug thread in the forums on his site.
YUP....screw htc! They say they have no plans to fix the authentication error. They say download a third party app from market! So they are essentially removing features we paid for!!

I made a custom dock and icons put it on sd card and loaded them using LP preferences for the dock and choose custom icon when puttingapps into the launcher dock. Custom docks and icons can be found on the launcherpro forums on the dev site