Covering support for customisations would mean the price for this service would be like 10x what it is, so i can understand they dont.
Anyway, just a thought, its probably that there is a style that conflicts between the extensions that causes this.
If I am correct in this theory, it is quite easy to fix. First thing you need to do is install a web developer toolbar in either IE or Firefox and determine the elements. For somebody new to CSS, a WYSIWYG tool is very useful.
Then you need to view the stylesheet (INFORMATION, DISPLAY ELEMENT INFORMATION) and check where the conflict is occuring. As long as its not a javascript issue causing the problem it will be quite easy to fix.
Warm Regards
Jeremy