First of all, I am really sorry to see your frustration. We wish to have been able to assist you.
No matter how you submit a bug - be it in the forums, tickets or the bug report form, we always seriously treat those and log them in our product backlog list to plan them accordingly.
You can start a bug report under your account's Get Support section:
In fact, we will be improving the layout of this page so that you can more easily find the support options. Also, we launched some time ago our Public Issue Tracking System where we collect all the bug reports and update the users on the status:
As for the problem you are facing - it is caused by the separation comma. The NumericUpDown stops allowing deleting more digits, because the number cannot start with a comma. We will fix this issue in the upcoming service pack which due in a few days.
Your Telerik points have been updated for your involvement.
Please feel free to contact us if you have any other questions about our controls.
the Telerik team
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items