Bugs

There is a general problem with all extra hardware connected to the Amiga which generates Interrupts at random or regular times. An example is my network card (Hydra), if I have running my TCP/IP stack nearly every installed program will freeze after a short time because the card creates PORTS interrupts (the same which are used by the keyboard) which cannot correctly replied by the installed program (after the rte immedately the next interrupt occurs). To avoid this problem the TCP/IP stack must be stoped before starting WHDLoad.
There are some rare hardware configurations which doesn't support the MMU related features of WHDload. Affected are only 68030 systems. The option MMU/S must not enabled on such systems! If the option is set, WHDLoad will freeze the whole machine. Currently the following hardware is known for problems: accelerator boards "Apollo A630" and "Magnum MK2".

The operation of switching between the operation system (OS) and the installed program is not completely reliable. The problem is that most Custom registers and some Cia registers cannot be read and therefore not be saved and restored. WHDLoad itself does not change such registers, but when it switches from the installed program to the OS (e.g. to load a file from the disk) the OS may change some of these not restorable registers. If the installed program depends on that all registers remain unchanged this will cause problems. It is known that the OS changes at least cop2lc, bltafwm and bltalwm, but perhaps also more. As a workround for this problem there is a possebility to restore the changed registers during the switch sequence. See AutoDocs/WHDLTAG_CBSWITCH_SET for more info.