I have a canon 1000D DSLR and a Sigma EF-610 flash. The Flash seems to work find in full Auto mode when attached to the camera body, but when I try to use it off camera I run into problems.
When the flash is off camera and connected with my (allegedly) ETTL cable, with the flash on either auto or either manual mode, the camera reports an FE Lock warning, and refuses to take a picture.
The cable is labelled TTL-C, and was sold as a canon ETTL cable.
I assume that the issue is with the cable (i.e. that it isn't actually an ETTL cable) but I wanted to double check with the experts here that it wasn't actually a problem with the flash (or the camera).