This is a new error (to me). As soon as I select plate solve it produces a valid display to confirm parameters from the FITS header, followed by, an error message - unable to read the image file. Unspecified error. However, if I leave it long enough it completes the solve correctly! Meanwhile, clicking the OK to acknowledge the error, the PS panel comes up with a stationary display (instead of the search continuing). Eventually the solve is completed. This is fully reproducible. Meanwhile all other displays are valid.
Lawrence Harris