SYMPTOM:
In Strategy Web 9.x, trailing spaces is not trimmed attribute elements in the checkbox selector when running a Report Services document in Flash mode against Sybase warehouse, as shown below:

NOTE: Horizontal scroll bar appears at the bottom of the checkbox selector and the attribute element name includes blank spaces at the end of the name.
CAUSE:
This is a known issue in Strategy Web 9.x.
ACTION:
Contact Strategy Technical Support for an update on this issue.
This issue has been logged as Scopus ID 553821 and TQMS ID 562053.