I have a program distributed to a couple of dozen customers.
I recently made an update to the program involving some revised reports required by the state government.
In all cases the update worked fine, except for one.
In this case one page of the reports (there are 5 reports in all) has experienced an odd bug. On certain of the lines printed (always the same lines), the printing is degraded so that it appears that a space has been written through the middle of the line of print; or over the upper-half of the line of print. The error is not random. Reprinting the report multiple times, or reprinting the report using different data gives the identical result
When in display mode, the report appears fine. Only during actual printing does the degradation occur. All other reports (with far more lines to print) are successful.
I've tried moving the location of the printing on the page, and that has helped some. But still the net result is unsatisfactory. Since this report is being submitted to a local court, the output is unacceptable.
The user's printer is an HP Officejet 6310 All-in-one. Allegedly, this printer works okay for all other printed tasks it has to deal with. It just doesn't like this one.
Any ideas for this bizarre bug?