The block/zone area of flow objects disappear when editing the object the second time. This happens only with Firefox 3.5 on Windows. Clearing browser cache, or setting it to 0 Mb, solves the problem. Decreasing it to 25 Mb also works. JH can reproduce it on ezp 4.0.1 and 4.0.4 (and has a video to prove it). GL can not reproduce it (on ezp 4.0.2).

• No custom flow blocks are used
• Standard admin design with flow is used
• No other browsers or operating systems seem affected
• No JS error is shown
• No Firefox extensions are installed except Firebug

  Steps to reproduce

• Clear browser cache
• Edit an ezflow object
• Discard draft
• Edit the object again
• The ezflow block/zone area below the "Set layout" button is gone