Thank you for contacting CHAX Software, Inc.

We made some deep research about the said issue and found a reliable source of reason why your CHAX software is unable to launch. This is regarding the Microsoft Update last August 13, 2019—KB4512508

To know more about Microsoft latest update, please visit the link below:

Our program runs through a Visual Basic application and part of the recent Microsoft update stated that "Applications that were made using Visual Basic 6 (VB6), macros using Visual Basic for Applications (VBA), and scripts or apps using Visual Basic Scripting Edition (VBScript) may stop responding and you may receive an "invalid procedure call error."

Microsoft is working on a resolution and estimates that the solution will be available in late August. 

We recommend to uninstall this Microsoft update. The following instructions below will help you to proceed on uninstalling the update: 

1. Open your Control Panel > Programs > Programs and Features (Add or Remove Programs)

2. Click on View Installed Updates

3. Search for KB4512508 and uninstall it (restart required)

NOTE: The above solution is a temporary fix until Microsoft will provide a resolution.