Has any encountered any issues with Visualforce pages not opening the User lookup when it is present on the page?

I have a VF page with an inputField element to a custom lookup to the User object.  When you click the lookup button, the popup doesn't open, but other lookups work with no issue.

Below is the sample code for my lookup:

<apex:inputField value="{!object.FKUser__c}" required="true" />

Please let me know if there is a workaround to this.

Matt

Has any encountered any issues with Visualforce pages not opening the User lookup when it is present on the page?

I have a VF page with an inputField element to a custom lookup to the User object.  When you click the lookup button, the popup doesn't open, but other lookups work with no issue.

Below is the sample code for my lookup:

<apex:inputField value="{!object.FKUser__c}" required="true" />

Please let me know if there is a workaround to this.

Matt