peaks/levels not displaying correctly?

Have you zoomed in on the peakfiles? Try shift +arrow down to reverse.

thank you mate,that is exactly what was the case-must have mashed my hand into the keyboard and done it with out realising.

I have similar problem. When I zoom in peakfiles, waveforms are displayed, but when I want to see a wider range of a project waveforms disappear and files are displayed with solid colour. Any help?