Hi Andy,
Sorry for the delay in responding.
The issue of Ribbonform being locked after an OpenFileDialog is closed has been fixed in v5.
Could you please refer the following forum thread to obtain the beta version of Essential Studio v5?
http://www.syncfusion.com/support/forums/message.aspx?&MessageID=57573Kindly let me know if you have any other questions.
Best regards,
Golda