Description of problem: The instant preview of equation graphics no longer works after upgrading from lyx-1.3.7-5.fc4 lyx-qt-1.3.7-5.fc4 to lyx-1.4.0-4.fc4 lyx-qt-1.4.0-4.fc4 Version-Release number of selected component (if applicable): see above How reproducible: always Steps to Reproduce: 1. Make sure "Preview" box is clicked in preferences 2. Load a lyx document with equations 3. No previews generated Actual results: Expected results: Additional info: The debug info shows lots of occurrences of: kpathsea: Running mktexpk --mfmode cx --bdpi 120 --mag 1+0/120 --dpi 120 cmmi10 mktexpk: Mismatched mode cx and resolution 120; ignoring mode. mktexpk: Can't guess mode for 120 dpi devices. Dropping back to the previous lyx version fixes the problem
I had an old version of dvipng in /usr/local/bin that lyx seemed to be picking up, instead of the new version in /usr/bin. Removing it fixed the problem.
Glad to hear you got it sorted out.