When you select a schedule report on any project and any schedule and it crashes It could be that there is a simple problem with the sheet.
If a schedule report has a version of a hidden sheet called "Very Hidden sheet" the report will crash ever time its open in KeyLAB.
To check you need to open the schedule report in normal excel and click alt f11 this will open the visual basic editor (VBE).
On the left-hand side there is a list of the workbooks and the sheet in each work book. Make sure you open the schedule report after closing all other excel files. When you open the VBE you will see the open sheet (sheet 1) and the workbook. If you have another sheet which you cant, see if your workbook its likely that the sheet is Very Hidden.
When you select the sheet, which shouldn't be there select it and go to the bottom of the list of properties on the bottom left of the page. There is a field called visibility there are three states you will need to set it to visible.
Once you have them all visible you can either select the remove them or keep them but you will not be able to make the hidden.