I had only one download manager installed at a time and ashQuick.exe still crashes sometimes.
Maybe you could create a dump, download and run
http://public.avast.com/~vlk/hangrep.exe. In the list of processes select ashQuick.exe and use the Save button. This generates a file which you can either send to his email address vlk (at) avast.com (if it's smaller than e.g. 1 MB, ZIPed), or upload to
ftp://ftp.avast.com/incomingThe command-line version
http://public.avast.com/~vlk/userdump.exe . The syntax is
userdump.exe ashQuick.exe c:\ashQuick.dmp(producing dump file in the root of C:\ drive)
Please note that prior to taking it, you'll have to temporarily disable avast self defense - otherwise, the program responsible for creation of the dump won't be able to open the process.
I'm not sure you will be able to run a dump of a crashed application, although. I'm not a programmer and never read about ashQuick.exe crashing before.
Also, check the folder <avast>\data\log
Are there any files called unpXXXX there (where XXXX is a random number)?
If so, send them to vlk (at) avast.com
They may contain more information about the problem (maybe a link to this thread).