Subreport only works if there a debug break-point

[projecttoday]

I have a report with 2 subreports on it. One of the subreports does not show on the report preview unless I set a breakpoint in the report's code. Set a breakpoint in the code (for no other reason), hit the breakpoint, continue, and the report works fine from then on, until you close the database and open it again, even if you remove the breakpoint.
The other subreport, which is similar, always shows fine.

Has anyone encountered something like this or can point me towards finding a solution? Obviously I can't find out what's wrong by setting a breakpoint.

 

[projecttoday]

A decompile appears to have solved the problem.