Here's the problem:
14/06/2012 10:27:45.277 : GetRainfallTotals: Error on line 135 of dayfile.txt: '''' is not a valid integer value
and
14/06/2012 10:27:50.449 : Error plotting charts at line 135 of dayfile.txt: '''' is not a valid integer value
14/06/2012 10:27:50.449 : Please correct the error by editing dayfile.txt
14/06/2012 10:27:50.512 : Error plotting charts at line 136 of dayfile.txt: '''' is not a valid integer value
14/06/2012 10:27:50.574 : Please correct the error by editing dayfile.txt
14/06/2012 10:27:50.637 : Error plotting charts at line 137 of dayfile.txt: '''' is not a valid integer value
14/06/2012 10:27:50.637 : Please correct the error by editing dayfile.txt
14/06/2012 10:27:50.668 : Error plotting charts at line 138 of dayfile.txt: '''' is not a valid integer value
14/06/2012 10:27:50.715 : Please correct the error by editing dayfile.txt
14/06/2012 10:27:50.746 : Error plotting charts at line 139 of dayfile.txt: '''' is not a valid integer value
14/06/2012 10:27:50.746 : Please correct the error by editing dayfile.txt
14/06/2012 10:27:50.840 : Error plotting charts at line 140 of dayfile.txt: '''' is not a valid integer value
14/06/2012 10:27:50.887 : Please correct the error by editing dayfile.txt
14/06/2012 10:27:50.918 : Error plotting charts at line 141 of dayfile.txt: '''' is not a valid integer value
14/06/2012 10:27:50.918 : Please correct the error by editing dayfile.txt
It should have flashed the error light to bring that to your attention - did that not happen? Perhaps the older build of 1.9.2 you're using doesn't do that for this particular error.
This is the problem in the file:
dayfile.png
I'm afraid I have no idea where those strange lines came from, but it looks like you just need to delete them, then all should be OK after a restart of Cumulus.