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I am using:
Firebird 2.5.8
Delphi 10.3.2
Unidac 8.0.1
Windows 10, but also WIndows 7

I connect to the database using SpecificOptions.UseUnicode set to True, Charset UTF8.
If I try to set values containing Ukrainian characters to VARCHAR field, it works ok.
But if I set value like 'стан добрий' to blob field (BLOB SUB_TYPE TEXT), charset UTF8, it is changed to characters like '????'
I do not know if it is connected to Delphi or Unidac version, but it was working ok for many years before upgrading my tools.

Am I doing something wrong? Maybe I missed some configuration in new Delphi compiler? Did something changed?
How to resolve it?

Resolved.

I had to set SpecificOptions.EnabledMemos=True in TUniConnection component.

(Why was it working ok without it?)

To solve the issue, you can set the TUniConnection.SpecificOptions.Values['InterBase.EnableMemos'] property to 'True'. For example:

andy_bri wrote: ↑Wed 04 Sep 2019 10:40 Resolved.

I had to set SpecificOptions.EnabledMemos=True in TUniConnection component.

(Why was it working ok without it?)

In previous versions of UniDAC, the property defaulted to True, and the user wasn't able to change its value. The new version of UniDAC allows the user to change the value of the property that now defaults to False. To revert the behavior, you only need to set the property to True.