Sonic Visualiser

From a bug report received by email. In the Spectrum layer:

• SV crashes when trying to change window size or overlap. Each
  individually causes the crash.

• Loads unpredictably, and can be very slow. The colour and form
  options (lines, blocks, etc) are unpredictable when trying to change
  them, and can cause a freeze.

• The measuring tool does not fit: there appears to be a problem with
  its scaling. For example, looking at a resonance series (all even and
  odd multiples of the fundamental), the octave marker is too wide,
  appearing instead on the 3rd resonance....etc.