problem with jpeg attachement in horde webmail

[myothan]

Sirs,

we noticed webmail in plesk ( horde ) crashes when viewing jpeg file with size over 900 Kbytes.
You have tested with different internet browsers ( IE, Mozzilla, Opera and Safari ).
What might be the problem behind this ? Our configuration or some bug in horde ?
Please advise.

Thanks and Regards,
mt