In the old Desktop 5.5 Instructions, it was indicated that the church would manage the security patches. However, there is no indication that they are doing any Windows patches.
Because of security concerns, some Stake Technology Specialists have taken the initiative to install patches themselves. So far there are no reports of it causing problems with MLS or other software. It does seem to cause a few quirks with the operation of Internet Explorer.
As for installing the Daylight Savings Time patch, you're probably on safe ground there.
As for changing the time and MLS - do not change the time when MLS is running. When you set the time back, you will not be able to run MLS until the time has gone beyond when MLS was last shut down. For example, if the last time you shut down MLS was at 10:30AM, but the computer clock said 11:30AM, you will have to wait until 11:30AM before MLS will allow you to run again. For this reason, it's best to adjust the time either the first thing after booting the computer for the day or the last thing before going home.
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