Work space in not opening in Siebel Web Tools

On : 19.10 version, Configuration - Dev Env

ACTUAL BEHAVIOR
---------------
work space explorer should be closed and Object explorer should be displayed.

EXPECTED BEHAVIOR
-----------------------
application hangs

STEPS
-----------------------
The issue can be reproduced at will with the following steps:
1. Login to Web Tools
2. Click on Work space icon
3. Open a work space
4. click on close button.
BUSINESS IMPACT
-----------------------
The issue has the following business impact:
Impacts dev timelines.

Steps to reproduce the issue
======================
1. Login to Web Tools
2. Click on Work space icon
3. Open a work space
4. click on close button.

Application hangs.

Tried executing a blank query and then followed the above steps from 2 to 4. Issue not reproduced.