I believe (for Rocket Theme templates and J1.5.5 atleast) I have found the solution for now. DocMan seems to cause the same issue for me in FF3 as RSG2 does. In searching I found this forum post.
In your templates Index . php file find the line below.
<jdoc:include type="message" />
<jdoc:include type="component" />
Then add the following tags. I didnt include the "message" line as I didnt notice one in my template. But I did wrap the "components" line in the tags.
<table><tr><td> <jdoc:include type="message" />
<jdoc:include type="component" />
</td></tr></table>Seems to have fixed my problem for both components.
If you would like to read the complete thread:
http://www.rockettheme.com/option,com_smf/Itemid,190/topic,37907.msg200375#msg200375 This worked for my template from Rocket Theme. Not promoting them just letting you know which theme product I am using and where I found the answer for now.
Hope this helps.
Brian