Empty workflow folder

[workflow@optonline.net]

Dear All - 
 
I have a bizarre issue: 
 
1) In SBWP when our European users drill down to a specific workflow folder, ' Enter Invoice', the folder is there, but no workitems listed. 
2) When a user double clicks on "workflow" folder (the one provided by workflow engine), without drilling down to that specific folder, the workitems are visible on that level.
 
Our American users do not have this issue, just our small group of users in Europe. The issue started for no apparent reason. Additional security profile was added for those users that day, but even when that profile was taken away the issue persisted. No other changes to the system were determined.
 
I have gone through OSS notes but have not found anything related there.
 
Any hints/tips would be much appreciated.
 
Best Regards.
Thad Gorbal 
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