A hotfix update to MetaTrader 5 version was released yesterday - build 5326. It's aim is to fix a critical issue with MQL5 code compilation and also implement two minor changes:

MetaQuotes' forum announcement thread:
https://www.mql5.com/en/forum/496756
If you notice anything strange with this build 5326 or if you find some bugs, please let us know by posting below.
- Fixed a bug that resulted in critical crashes when MQL5 code used implicit constructors and copy operators for its classes or structures.
- Added a check for password length to ensure compliance between MT4 and MT5 account password when transferring accounts to MT5.
- Changed the Trade tab to display the ID column for open positions only when at least one position has a non-empty ID.

MetaQuotes' forum announcement thread:
https://www.mql5.com/en/forum/496756
If you notice anything strange with this build 5326 or if you find some bugs, please let us know by posting below.