There have been a few bugs fixed since the release of 5.4. I've now back-ported the fixes to the 5.4-fixes branch and updated the pre-built compilers for all the architectures. The two issues that seem to have caused particular problems are the divide instruction bug that caused an assertion fault in the garbage collector and the failure to pass floating point rounding control that meant that IEEEReal.setRoundingMode didn't have any effect.
I'm planning to release this as a bug-fix release in the next week or so unless anyone reports any problems. Because the pre-built compilers have been updated it should only be necessary to run ./configure make in the fixes branch. Run "make distclean" if necessary to get a clean directory.
David