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I have just released new versions of these libraries
G4P V3.3.1 download here
GUI Builder (G4P Tool) V2.3.1 download here
or you can wait for the PDE to detect the new versions and install them then.
The changes to G4P are related to using styled text with the GTextArea and GTextField controls. It is now easier to apply text attributes to the test appearing in these controls but has required updates to the StyledString class.
GUI Builder has had a couple of bug fixes and some internal refactoring.
What it means is that GUIs created with earlier versions of the tool cannot be edited with this version. So before you update G4P and GUI Builder I recommend that you finalise any outstanding GUIs.