Matrix view of report not working

[SFJW]

The Matrix view of timesheet reporting I've set up won't display. Is this a bug or have I done something wrong? Chart and Details display absolutely fine. 

[SFJW · Accepted solution]

Fixed - for some reason having days with no data was messing up the matrix view. Resolved!

[Madalyn_Destafney]

If this happens again in the future, for some reason I've found deselecting this checkbox in your matrix groupings gets it to work...