[Lazarus] lazarus-0.9.30.2-fpc-2.4.4-win64 error

[Lazarus]

Hello,

As reported in another thread (sorry for the squatting), after an update 
(lazarus-0.9.30.2-fpc-2.4.4-win64) I now have applications that compile no 
more: error is C:\lazarus\lcl\interfaces\win32\interfaces.pp(32,3) Fatal: 
Can't find unit InterfaceBase used by Interfaces.

A fresh new project, with a single button, compiles.

I deleted the project (.lpr & .lpi) in the directory where is one of my faulty 
applications and Create a freesh new application and save it with the project 
name of the faulty application in the directory of the faulty application and 
a new name for the main form unit.

Building the application failed with the above error.

-- 
A. GUÉRIN