In the last few hours, some users who have an iMac or Mac mini with Fusion Drive and run macOS Mojave 10.14.5, have received an update just for your teams. This patch fix a problem with Boot Camp. Apparently the latest version of macOS Mojave 10.14.5 prevented the correct use of the Boot Camp partition.
This problem seemed to affect only one part, but it is a problem that the company has to correct in the shortest possible time. After the patch installation and the mandatory reboot, the problem should be completely resolved.
Those who do not know Boot Camp, is the function that allows to run a windows version on a Mac, without virtualizing windows. The operation is to create a partition for this purpose in the internal memory of our Mac and start the Mac as if it were a PC. The files found on each of the partitions can be shared among them for efficiency.
On the Apple support page you can on request briefly the description of the fix from Apple. From this page you can download this little update. Surely some developer left some programming point unclosed, a fact that prevents the connection with Boot Camp. Apple's reaction has been quick, but these types of errors should be eliminated in a company of the stature of Apple.
Apparently the problem arose when the user plans to create a new Boot Camp partition on an iMac or Mac mini with Fusion Drive. What is not known is whether this problem affects another type of storage memory. However, we think that in this case cases would have been detected, leading Apple to its solution similar to the current one. In contrast, other Fusion Drive users report that they have had no problems creating Boot Camp partitions. In any case, if you have these discs and version 10.14.5 of macOS Mojave, we recommend installing it, to ensure correct operation.