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Because a bug-reporting system is literally full of bugs.

RAD Studio, Delphi and C++Builder 10.3.3: List of Patches We've released a number of patches for RAD Studio 10.3.3. To ensure you know about all of them, and can install correctly, here is a list and some overview information. If we release any others, we'll update this blog post with details. https://community.idera.com/developer-tools/b/blog/posts/rad-studio-delphi-and-c-builder-10-3-3-list-of-patches?fbclid=IwAR0EcZ8TvyWslDSLoMzHP64WcIrZtynO727eZyXC90aXpomENWm0OEKV17g

You must control transaction under Firebird ... ReadTransaction.Connection := FDConnection1; ReadTransaction.Options.ReadOnly := True; ReadTransaction.Options.Isolation := xiReadCommitted; ... SelectQuery.Transaction := ReadTransaction; http://docwiki.embarcadero.com/RADStudio/Rio/en/Managing_Transactions_(FireDAC)

By setting the correct isolation level, record version and wait-option for the transaction. https://ib-aid.com/en/how-to-track-deadlocks-in-firebird/ As I said I'm not familiar with FireDac so I'm not sure how to set it. https://stackoverflow.com/a/56337589/1037511 (Something like read_committed, rec_version and nowait should fix deadlocks on select)

Maybe this is not a dialectic principle but the reality consists of fluctuating sets? (Quantum fluctuation).

I've updated my project so it now not only sends messages via gmail... but it can send hotmail.com/live.com/outlook.com emails. GmailAuthSMTP supports the XOAUTH2 and OAUTHBEARER authentication types and so could probably support other mail providers if they use those standards as well. https://github.com/geoffsmith82/GmailAuthSMTP/

Embarcadero will be releasing a hotfix for 10.3.3 soon to address this in the shipped version of Indy.

I have no experience with FireDac, but shouldn't you create a TFDConnection in each thread to be used with TFDQuery? As is shown in http://docwiki.embarcadero.com/RADStudio/Rio/en/Multithreading_(FireDAC)

In my world I need to build against multiple different versions of the same library. This is not an obscure requirement. It happens pretty much anytime you maintain development and release branches. When you maintain legacy versions. This is a mainstream scenario in any professional programming setup. Global settings are simply incompatible with that.

@A.M. Hoornweg, did you checked THttpClient API ? accept gzip encoded data: set THttpClient.AutomaticDecompression to [THTTPCompressionMethod.GZip] accept an invalid/self-signed SSL certificate: set THttpClient.OnValidateServerCertificate to event handler which optionally can analyze Certificate and set Accepted to True / False