topic Acessibility mode not working on Desktop in Product Forum

Acessibility mode not working on Desktop

Carlos_Medina — Fri, 16 Aug 2024 13:46:58 GMT

Hello everyone,

Today we're facing a problem. We had a lot of elements mapped with accessibility mode in a desktop application, but after updating some Windows KBs, it stopped working. The option is still available, but it can't find anything with accessibility mode. Is there anything that can fix this, or is it a bug introduced by the new KB?

KB5041773
KB5041961
KB5041576

Re: Acessibility mode not working on Desktop

steven.boggs — Fri, 16 Aug 2024 14:39:08 GMT

We've seen in the past after pushing O/S updates or patches to Runtime Resources, customers may encounter issues with AA Mode such as the following:

System Exception - (xxxxxx) not found when trying to highlight AA spied elements.
BP may crash while trying to spy in AA mode.
Already spied AA element cannot be highlighted.
Re-spying with AA mode may not work.
There are times when you close and reopen BP, AA elements will work for a short period and then break again.

Sometimes this issue can be easily fixed by re-registering the OLEACC.DLL file (usually located here: 'C:\Windows\System32' directory).

However, if re-registering doesn't help to fix the issue, then your next option is to delete some registry keys.

Important: Deleting registry keys should only be done by your IT team and it's always advisable to backup the registry before making any such changes.

The following registry key has to be deleted because after the upgrade, the Accessibility COM object is sometimes unable to pick the right Bit-ness version (i.e. 64- or 32-bit) to work with, hence the AA spy issue:

[HKEY_CLASSES_ROOT\WOW6432Node\Interface\{618736E0-3C3D-11CF-810C-00AA00389B71}]

Remember to reboot machine after deleting the key.

Re: Acessibility mode not working on Desktop

zdenek.kabatek — Mon, 19 Aug 2024 08:16:18 GMT

Hi, Carlos_Medina,

can you check that you are attached to the right instance of the application?

Regards

Zdenek

Re: Acessibility mode not working on Desktop

Carlos_Medina — Mon, 19 Aug 2024 19:08:32 GMT

Thanks, it was solved by deleting the registry keys and restarting the computer.