Today we released two separate hot-fixes for RAD Studio, Delphi and C++ Builder 10 Seattle Update 1. The first has replacement C++ CLANG compilers for the international versions of the product. The English version is not affected by the problem. The download is at
http://cc.embarcadero.com/item/30454
The second is a fix to a GDI resource leak in the Modern Themes package, that would slow down the IDE over time. In this case the issue affects all versions and all customers. This second fix can be downloaded from
http://cc.embarcadero.com/item/30453
I want to personally thank the RAD Studio Development and QA team for working on these issues promptly and provide a solution in a short amount of time. PS: Thanks also to the Delphi community for reporting, tracking and isolating the issue and helping us nail it down faster