MetaTrader 4 platform update is to be released on Tuesday, June 7, 2016. This hotfix update build 971 follows the previous release.
It fixes saving a custom indicator line color if the color is specified
as None. Previously, this setting was reset after restarting the
terminal causing the line to be displayed in black.
We apologize for the inconvenience.
I don't think that is a build 971 issue, but rather you are not terminating/closing your #import properly (see documentation):
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