org.eclipse.swt.SWTError: No more handles
Had Studio open with several reports active.
Had been using it heavily over 2 days without restart.
Created new report through the wizard.
Got base report going, positioning with 4 detail fields, title, 1 group, several variables: not complicated.
Added Data set to report.
Could not open data set dialog, getting the above exception.
Mighted have added HTML5 chart before trying Add Data Set.
After this exception, could not edit other reports.
Had to restart Studio to continue.
Has happened several times, I don't think always on the data set dialog.