Windows 10 emergency updates released to fix printing crashes By Update: Microsoft now warns of additional issues when printing after installing the March updates. Microsoft has released out-of-band non-security updates to fix a know Windows 10 issue causing blue screens when printing to network printers after installing the March 2021 cumulative updates. According to Microsoft, the cumulative updates released today are addressing "an issue that might cause a blue screen when attempting to print to certain printers using some apps and might generate the error, APC_INDEX_MISMATCH." The cumulative updates containing the fix released today are published as optional updates so they will not be installed automatically via Windows Update.