Users make use of java webstart (2.6) and have in their dashboard a floating right sidebar.

There seems to be some strange behaviour:
- on my pc the sidebar is transparant and on client pc sidebar is white
- when I open a field values are shown as expected and when collapsing the field values are gone. On client pc, field is collapsed but values are still visible behind all fields. When moving mouse over certain area on sidebar, values disappear. Not sure where to hover mouse over.

Can you please find out what this might be? Not a very urgent issue, but it is better not to have this