attachment problem on line 621 in compose.php3

[Cory Merritt]

I have tracked the browser timeout issue that I am experiencing down to line 
621 in compose.php3 --> IMP 2.2.6.   

The line reads:

$file_part->contents = chunk_split(base64_encode($contents . "\n";

With max_execution_time set to zero, the browser web page times out waiting for 
some data from IMP.  If the max_execution_time is set to 30, the web page gives 
an max execution time exceeded message. Is there a way to have the script still 
communicate with the browser while the attachment is being slit up or whatever 
is happening on line 621.

Helllp....