file not uploaded for security reasons

After upgrading Joomla to the latest 3.4.5 version, certain types of files are not uploaded from FC.
This is not merely about whitelisted extensions. I've tried to upload two ZIP files smilier in size; one got uploaded, whilst the other did not go through, resulting in the error message mentioned in the subject line of this post.
Apparently this strange behaviour is due to an issue in the Joomla core that has recently been fixed.

Other extension developers had to update their code in accordance, as reported in this JCE thread.
www.joomlacontenteditor.net/support/foru...date-joomla-to-3-4-4

Hello

here is a new (short-term) issue (v3.0.9 milestone):
github.com/FLEXIcontent/flexicontent-cck/issues/332

we use
JFile::upload(...) to which we can pass configuration of how to perform the file checking, and which files to check

While 3.0.9 is in the works, which exact file should I retrieve from the repository?
Or should i just get the component package and install it over the current version?

just install => that an update

Hello

change will be in 2 files (only 2 files use JFile::upload),
you can patch current version or test with v3.0.9-rc

Fix is coming shortly for this and the other remaining issues with v3.0.9 milestone

Hello

fixed this and other (issues of v3.0.9-rc)
that caused bugs to
- file / minigallery / image fields

See v3.0.9-rc2 (2015-11-10)
github.com/FLEXIcontent/flexicontent-cck/releases