We strongly suggest that everyone update to a stable version (for 2.4, that's 2.4.6.2). Each release contains many bugfixes, a lot of them concerning browser (in)compatibilities.
Upgrading to the latest stable release for the mendix platform 2.4.6.2 is not without risk, and therefore not feasable at this time. However, I'd still like an answer to my question, thanks!