A new version of MetaTrader 5 is now available through auto-update - build 5120. It's a major bug-fixing release that patches the issues introduced in build 5100:

MetaQuotes' forum announcement thread:
https://www.mql5.com/en/forum/488851
If you notice anything strange with this build 5120 or if you find some bugs, please let us know by posting below.
- Fixed the terminal's interface in Linux and macOS.
- Optimized how the platform updates the standard MQL5 libraries when a new build is released.
- Changed the interface to restore to a full-screen one when restarting the platform.
- Changed multiple functions in MQL5 to accept signed/unsigned types interchangeably.
- Fixed returning key values retrieved via the
TerminalInfoInteger()
function. - Fixed the
ArrayInitialize()
function's work with enum arrays. - Updated AI models for the built-in AI assistant.
- Added strict hash-based file status verification to the MQL5 Storage service.

MetaQuotes' forum announcement thread:
https://www.mql5.com/en/forum/488851
If you notice anything strange with this build 5120 or if you find some bugs, please let us know by posting below.