QNetworkAccessManager issue on Qt 4.8.7

I have some QNetworkAccessManager related code that uploads files to my server. It has been working for several years without any problem on Windows and Mac.

I updated my Mac from Qt 4.8.6 to Qt 4.8.7 and the code now fails the upload every time.

The symptoms are that after a QNetworkAccessManager:: post() there are 2 QNetworkReply:: uploadProgress() signals, then no further QNetworkReply:: uploadProgress() signals and no QNetworkReply:: error() or QNetworkReply:: finished() signal.

The QNetworkReply::uploadProgress signals come after 16384 and 32768 out of 126151 bytes are uploaded. It is a bit suspicious that it hangs after 32768 (2^15) bytes.

I don't want to post the code here as:
-There is quite a lot of it.
-It contains stuff specific to my web server.

I have rebuilt Qt 4.8.7, but it made no difference.

Does anyone know why changes in Qt 4.8.7 might affect QNetworkAccessManager:: post()?

I haven't tried Qt 4.8.7 on Windows yet.

I expect you will have to provide a minimal compilable example that demonstrates the problem against a suitable test target in order to get specific help or lodge a bug. The size looks like it might be an internal buffer filling. Is anything hitting the server at all?

The server is receiving some data.

Because of the server and the use of third party code, it is difficult to create a minimal example that shows the problem.