Tape will not retract

Sounds like the carrage is out of time with the deck. Either that or the mode switch (the switch that senses the location of all the gears on the deck) is in need of an internal cleaning. When the contact pads on the mode switch get a little corroded it will confuse the microprocessor that controls loading and it will not know where the gears really are.
Good luck.

Although not the same camera i have just followed most of the advice on here regarding tapes not retracting, taken the camera apart and found a small piece of gravel under the heads stopping it from rotating, took it out problem solved camera works fine after 12 months of sitting there getting in the way.
regards pete de G7VHJ