Moodle install is missing 'aggregationcoef.html' help file. To reproduce, have a subcategory in the gradebook that is a 'Weighted Mean of Grades'. Then click:
--'Edit Categories and Items'
--Click on the 'Edit' icon by the category
--Click on the help icon next to 'Item Weight'
A dialog pops us that says "Help file "aggregationcoef.html" could not be found!"
I've checked for this file in 1.9.2+, 1.9.2, and can't seem to find it anywhere. Either the php is looking for the wrong file, or the file doesn't exist, IMHO.