I just installed Firefox 3.5 and now X1 Professional Client Version 6.2.4 (Build 3631bp) (Created: Tue Mar 31 23:49:10 PDT 2009) causes Firefox to open with a error message that is an HTML page. IE7 does not do this.
I played around and uninstalled the RSS plugin, and the error stopped. I did not have X1 configured to read RSS feeds, so it must have been some error connected with the lack of feeds.
This is what is in the Firefox error box in the middle of the screen:
file://C:\Documents and Settings\srose\Local Settings\Temp\X1\Error.html
Once I removed the RSS plugin, this stopped happening.
steve rose