Freezing frames in IE 6 with Activex in one frame and applet another

[shetes]

I have the following frame structure:

<frameset id=fset1 rows='10%, 90%'>
<frame id=fm1>
<frameset id=fset2 cols='30%, *'>
<frame id=fm2>
<frameset id=fset3 rows='100%, *'>
<frame id=fm3>
<frame id=fm4>
</frameset>
</frameset>
</frameset>

fm1 has an applet and fm2 has an html page loaded.

With an html page loaded in fm3 and an applet loaded in fm4, things work both in IE 5.5 and IE 6.0.

When an activex is loaded in fm3 with the applet yet in fm4, if 'top.fset2.cols = ...' is executed, the frames freeze in IE 6.0 but work in IE 5.5.