Hi,
 
I have the same problem you have.
I made a patch to solve this problem but the Roundcube developers are not interested to apply it (I don't know why).
Feel free to apply the patch attached at your own risk.
I stopped having problems opening attachments after applying these patches.
 
Regards,
DC

2011/2/18 邓卫华 <dengwh@bestcheer.com>

Hi,

  im useing roudceubemail 0.5stable, i have a problem about open pdf file in roundcubemail. the roudcubemail can not load PDF files and has been displayed "LOADING data".

please the attached file.

IE8.0

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