ID Window locking up when trying to change the occurrence for a Data type

These are the steps I take to get the issue.

Log into XI - ID.

Create new data type.

Insert a new element.

when i change the the pop-up window that lets me select the 0..unbound does not pop up, but it puts my main XI-ID window in the background which locks up my session. I have changed my java version on my PC and tried the following three versions (1.4.2_16, 1.4.2_18 and 1.6.0_11) none of them work.

Any help would be greatly appreciated.

Thanks

Skip Ford