Symptoms

When using Citrix Xenapp, we have a single user who is not able to view their tasks and is not able to click on 'search', 'filter', etc... The user (who does have several tasks) logs onto the SharePoint page. He does not see any tasks. We typically tell users to filter and click "OK" to default settings as a workaround. However, he is unable to click those icons at all.

He is able to navigate to the workspace and can view several tasks. But, he does not see those tasks in SharePoint.
 

Diagnoses

During testing, we found the following:

a. If the same non-working account used IE11 locally (instead of IE9 through XenApp), they also did not see this non-clickable icon issue
b. If the same non-norking account used IE11 locally (but ran it in IE9 Document Mode) they also did not experienced this issue
c. Other accounts when using the IE9 (through the XenApp) also did not experience this issue
d. Running IE's Developer console logged the following script error:
SCRIPT5022: DOM Exception: QUOTA_EXCEEDED_ERR (22)

Unfortunately, Citrix XenApp is a third party application but research it appears that it is just launching IE9 from a Citrix server/machine somewhere and exposing it in a way that looks like a local application. I also read somewhere that there may also be a Citrix Xenappprofile concept when using this "remote IE application". Perhaps there is an issue/size limitation with this profile/citrix machine.
 

Resolution

Resetting the user's Citrix profile resolve the issue when loading the K2 worklist AppPart through a Citrix XenApp IE9 browser.