We have not heard of this issue previously. However, to help us better understand the environment, could you please email us your Formativ Configuration in both circumstances, i.e. when you login during/after Windows XP startup.
Not that it should be relevant to the cause but do you have intelligent applet caching enabled? You can see the settings in the Formativ Control Panel Applet (Windows Control Applet).
If you are not already aware, you can send us the Formativ configuration information by selecting the GroupWise client’s Help menu, select About Formativ, select the Configuration tab and use the Copy to Clipboard button, then paste the config info into an email to email@example.com.