Hi,
Couple of things to verify in such cases.
1. Please make sure Citrix settings are not changed / modified un-intentionally. Please leave them unencrypted and uncompressed.
2. Please make sure Citrix-ICA policy is present and is enabled.
3. Please make sure there are no duplex issues at server / client side WAE interfaces, though this will affect all traffic and not only Citrix.
Hope this helps.
Regards.
PS: Please mark this as Answered ,if this answers your question.