3
attention pd-download and wf-download (especially versions above 2.x) have a different sql, so you cant simple copy the changes from pd-download to wf-download.
restore the default sql syntax of wf-download and try simple let the cid thing away.
when you compare the pd-download sql syntax from posting #17 with the default sql syntax you will that i have simple deleted the cid degleration because it have auto increment.
and i hope that is the problem of MySQL 5, but i'am not sure because i cant reproduce the problem - do you have the same problem with pd-downloads 1.2? could try the changes from posting #17 in pd-downloads 1.2 and report me what happend.
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