Hi David,
Well I too had that patch install yesterday and it has done no damage to my WAMPServer, so I dont think you can necessarily lay the blame at that door.
This error sounds like the wampmanager.tpl file has been badly amended or corrupted
Or
One or both of the images_off.bmp or images_on.bmp file(s) have been corrupted.
Have any of these files been chnaged intentionally or accidentally recently by you or maybe a Virus Checker?
If you have a recent backup of wampmanager.tpl and wampmanager.ini you could try restoring them from your backup.
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(Windows 10 Pro 64bit) (Wampserver 3.3.4 64bit) Aestan Tray Menu 3.2.5.4
<Apache versions MULTIPE> <PHP versions MULTIPLE> <MySQL Versions MULTIPLE>
<MariaDB versions MULTIPLE> <phpMyAdmin versions MULTIPLE> <MySQL Workbench 8.0.23>Read The Manuals Apache --
MySQL --
PHP --
phpMyAdminGet your Apache/MySQL/mariaDB/PHP ADDONs here from the
WAMPServer alternate Repo-X-X-X-
Backup your databases regularly Here is How dont regret it later! Yes even when developing -X-X-X-