Internal Server Error when updating theme

Hi all. I’ve been struggling with this problem for quite some time now.

When I try to add a widget or update my theme ie. the sidebar I get this error when looking at my site:

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, support@supportwebsite.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Apache/1.3.33 Server at http://www.thebetanews.com Port 80

I’ve tried with different themes and I always get the same error. After I’ve added the widget or edited the sidebar and I hit F5 to update to see the updates, the error occurs. I must then update a few more times and the its gone. Funny thing the sidebar and widget isn’t updated. This isn’t a browser cache problem. I’m running two other blogs where its working just fine.

I’m running MySQL 5.0 on GoDaddy.

Ps: If I look at my site after an update with another browser it sometimes shows the updates other times the above mentioned error. :-/

Any help is greatly appreciated.