We are running into this issue as well after a fair bit of work getting things running locally. This is very disappointing to us. I'd like to see you do two things:
1. Warn users clearly that the control will not work on non-Windows environments.
2. Provide a parallel component that works on Linux and Windows.
Hello,
I have brought the matter to our Product Managers for discussion. I will get back to you with an update once they've reviewed the request.
Regards,
Martin
Progress Telerik
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Hello,
At this point we cannot re-write the Captcha to use a different dependency as it will cause a breaking change for a lot of users. However, the Captcha is not completely bound to the System.Drawing package. You can pass your own images through the handler configuration.
Regards,
Martin
Progress Telerik