user80788: I have found a different receiving address within my wallet that is not mine... at least I did not create it. It seems to me that all of my transactions are now going to this new address instead of into my wallet. is there anything that I can do to recover these missing or stolen transactions?
In the debug log file on 1/1/18 I found that Bitcoin 12.0 was restarted and this shortly after, among other things:

InitParameterInteraction: parameter interaction: -whitelistforcerelay=1 -> setting -whitelistrelay=1

Seems like someone got in and redirected my transactions. Am I paranoid or did I just get robbed?

user51948: 
I have found a different receiving address within my wallet that is not mine.

If it is in your wallet then by definition it is yours (unless you added it as a watch-only address which I doubt in this case).
It could be a change address, automatically generated by your wallet to receive change from another transaction you sent. Without more info it is hard to say though. 
The -whitelistforcerelay=1 parameter is nothing to worry about, that only relates to the relay of blocks between peers and is nothing to do with your transactions or wallet.

80788: <p>I have found a different receiving address within my wallet that is not mine... at least I did not create it. It seems to me that all of my transactions are now going to this new address instead of into my wallet. is there anything that I can do to recover these missing or stolen transactions?</p>

<p>In the debug log file on 1/1/18 I found that Bitcoin 12.0 was restarted and this shortly after, among other things:
<code>
InitParameterInteraction: parameter interaction: -whitelistforcerelay=1 -&gt; setting -whitelistrelay=1
</code>
Seems like someone got in and redirected my transactions. Am I paranoid or did I just get robbed?</p>
 51948: <blockquote>
  <p>I have found a different receiving address within my wallet that is not mine.</p>
</blockquote>

<p>If it is in your wallet then by definition it is yours (unless you added it as a watch-only address which I doubt in this case).</p>

<p>It could be a change address, automatically generated by your wallet to receive change from another transaction you sent. Without more info it is hard to say though. </p>

<p>The <code>-whitelistforcerelay=1</code> parameter is nothing to worry about, that only relates to the relay of blocks between peers and is nothing to do with your transactions or wallet.</p>
