I have just updated the "Compatibility" and the "Common Problems & Causes" sections of the 1st post. This will solve most people's problems.
Please read them before posting about problems. 
They aren't just me telling you to reboot your PC, they really are all the causes and solutions I and other people have found so far, plus some general tips. I will post them again below just to make sure people do read through them now they are updated!
3: Compatibility:
This plugin replaces parts of DemonBuddy's item-looting behavior tree, and huge parts of DemonBuddy's town-run/vendor-run behavior tree. Any plugins with custom item pickup code, custom town-run handling etc. will likely cause problems.
Batch-Restarters/Auto-Launcher/Reloggers/Command-Line-Launchers:
Some batch restarters, auto-reloggers, and command-line launchers currently bug DemonBuddy out with large plugins, as DemonBuddy tries to run a routine the instant it loads without waiting for plugins to be loaded.
If you have problems and use one of these, please try running DemonBuddy manually the normal way to see if that fixes it, and check the threads of any relogger/launcher application you use to see if they have an update or a fix for this.
Stove's Goblin Hunter, Kane's AGB Sarkoth, Inrego's Fastest Sarkoth Plugins:
These are 3 plugins I know of that use custom item-pickup code, that will interfere with mine. You can still use those plugins, but you will need loot-rules that filter out items and NOT use world object handler plugin option to ignore loot-rules. Try the loot rules here:
[url]http://www.thebuddyforum.com/demonbuddy-forum/plugins/60523-plugin-giles-stash-loot-rule-replacer-9.html#post640304[/url] (post #337 of this thread), or ask the creator of the plugin you use to offer a version without custom item pickup
Incubus Custom Combat Routine:
Some people using this fork of Belphegor say it causes problems because you have to start DemonBuddy instantly - which means plugins don't have time to load.
Other Plugins:
There are many plugins out there. If you have problems, please list all plugins you use. Note that many people still use "NotificationOKClicker" and "Unstucker" - these are now old, have not been updated, and can cause various problems. DemonBuddy has it's own built in notification clicker, and an unstucker (though not a very good one at the moment), and an inactivity timer (measured in minutes, on your settings tab).
4: Common Problems & Causes:
Random Problems:
First check the compatibility section above, particulaly regarding any auto-loader etc. and rule those problems out. Then please try a new, CLEAN install of DB - honestly, quite a few problems are fixed by installing a clean version of DemonBuddy in a new folder, rather than simply over-riding the old DemonBuddy folder with an update, and then installing the latest version of any plugins you use. Always try this first if you have major problems. Also, please ensure you installed it in a folder called "GilesStashReplacer", in your "Plugins" folder. NOT a folder called "GilesStashReplacer v1.8" or anything else, JUST "GilesStashReplacer". Also make sure both the .cs file and the .xaml file are within that folder.
Picking Up White Items:
If you AREN'T using a plugin with custom pickup code, and AREN'T using any form of auto-launcher for DemonBuddy, then check these things:
1: Make sure you aren't at the login-screen when you load DemonBuddy. If you are, then plugins do not load (I know, right!?!?).
2: Make sure the plugin is loaded before clicking start in DemonBuddy. Click the plugins tab - when the plugins appear, then they are loaded. DemonBuddy can sometimes take 5-10 seconds to load all plugins in. ALWAYS wait for them to load before starting. Incubus Custom Combat Routine (see compatibility section) may cause problems with this.
3: Make sure you have selected "Use Giles Filters Below" in the config window. Only select "Use Custom Pickup Loot Rules" if you are using an incompatible plugin (see above section), or are an advanced user and want your own loot-rules to be used.
4: Check the config file is being created properly - check the plugin folder and open "StashReplacer.cfg" - check it has your selected options in, and isn't a blank file.
Salvaging/Selling Legendaries:
Sadly this is a bug within DemonBuddy itself, and would happen even without any plugins - it happens because DemonBuddy sometimes fails to read Diablo 3 memory correctly for items, and gets very confused about what an item is - there is nothing my plugin can do to force DemonBuddy to read memory correctly once it does this. Launching a new D3 game, or restarting DemonBuddy, can fix a current memory-read issue, but they can crop up at random. My plugin tries to filter out and avoid as many of these issues as it can, with various failsafes and validation checks, but ultimately it can't compete with the nature of this bug - we are awaiting a DemonBuddy update to fix this permanently.
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