After updating to 12.0.4.21 I None of the project can not be edited text box 
Автор: Vojtěch Z.
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After updating to 12.0.4.21. I None of the project can not be edited text box ( show up with no text ) ! Can I uninstall this update ? I need to work .
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Hello Vojtěch Z.,
Does the same happens also in a new project?
Try to repair the .NET Frameworks by following these steps:
Go to Control Panel > Programs and Features > Turn Windows features on or off
Clear the check box for Microsoft .NET Framework 3.5.1 and then click on OK. Clear also the check box for Microsoft .NET Framework 4.6 and then click on OK.
After Windows disables the feature you will need to go back to re-enable Microsoft .NET Framework 3.5.1 and 4.6 and then click ok.
Many thanks!