What brand of optical cable do you have?
I had purchased a Monster cable Optical (quite the rip off compared to the Outlaw Optical cable) and for that one cable I have to push really hard to lock it into place. My other optical cables (outlaw) work fine. When I comparred the length on the connector for the Outlaw and the monster, they were the same.
Good Luck
Charlie
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Charlie,
Outlaw 970, B&K AV5000, Paradigm Ref 20 and CC (V1), Martin Logan Dynamo, Sony 42" RPTV, Toshiba HD-A1