UPDATE: I put on debug mode...if you look at http://rossputin.com the errors are there for all to see. It's so far beyond my abilities to find and fix this problem...could really use some help!

OK, now I have a very different problem:
I get this when loading main blog page:
Deprecated: Assigning the return value of new by reference is deprecated in /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/skins/mystique/_skin.class.php on line 645 Warning: Cannot modify header information - headers already sent by (output started at /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/skins/mystique/_skin.class.php:645) in /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/inc/_core/_template.funcs.php on line 341 Warning: Cannot modify header information - headers already sent by (output started at /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/skins/mystique/_skin.class.php:645) in /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/inc/_core/_template.funcs.php on line 40 Warning: Cannot modify header information - headers already sent by (output started at /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/skins/mystique/_skin.class.php:645) in /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/inc/_core/_template.funcs.php on line 279 Warning: Cannot modify header information - headers already sent by (output started at /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/skins/mystique/_skin.class.php:645) in /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/inc/_core/_template.funcs.php on line 280 Warning: Cannot modify header information - headers already sent by (output started at /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/skins/mystique/_skin.class.php:645) in /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/inc/_core/_template.funcs.php on line 281 Warning: Cannot modify header information - headers already sent by (output started at /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/skins/mystique/_skin.class.php:645) in /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/inc/_core/_template.funcs.php on line 282

An unexpected error has occurred!

If this error persists, please report it to the administrator.

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Additional information about this error:
wrong $params

I get this when I go to skin page in back office:
Deprecated: Assigning the return value of new by reference is deprecated in /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/skins/mystique/_skin.class.php on line 645 Warning: Cannot modify header information - headers already sent by (output started at /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/skins/mystique/_skin.class.php:645) in /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/inc/_core/_template.funcs.php on line 40 Warning: Cannot modify header information - headers already sent by (output started at /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/skins/mystique/_skin.class.php:645) in /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/inc/_core/_template.funcs.php on line 279 Warning: Cannot modify header information - headers already sent by (output started at /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/skins/mystique/_skin.class.php:645) in /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/inc/_core/_template.funcs.php on line 280 Warning: Cannot modify header information - headers already sent by (output started at /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/skins/mystique/_skin.class.php:645) in /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/inc/_core/_template.funcs.php on line 281 Warning: Cannot modify header information - headers already sent by (output started at /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/skins/mystique/_skin.class.php:645) in /hermes/waloraweb097/b513/pow.rosspcom/htdocs/blog/inc/_core/_template.funcs.php on line 282

It seems the mystique skin is not compatible with b2evo 6. We'll fix it. Until then, please use a different skin.

Will do...thanks!

@rossputin a new update has been published for the Mystique skin (http://skins.b2evolution.net/mystique-1). Please, download it and test again in your recently upgraded site.

Thanks.

I'll download the update. Can you please tell me what I need to do to make sure that after the update is installed it has any customizations I've made (which I don't remember because it was so long ago)?

Well, if you customized your skin at code level and you don't remember what you did, then you should compare the entire Mystique folders (old vs new). For example, using Beyond Compare (http://www.scootersoftware.com/) you can find all the differences between both folders. This can give you an idea about what you need to change in order to restore your customizations.

Is there any way you can tell me what was modified in the update to Mystique to make it compatible with the current b2evolution?

@rosscode yes of course. If you're familiarized with GitHub, you will find all changes done in these commits: https://github.com/b2evolution/mystique_skin/commit/5b3242b7bd94f5d577bc4abb46640ae1a3b037c3 and https://github.com/b2evolution/mystique_skin/commit/ad26e6890847ddc1ed5fde304183d0858ffb3759

If not, this is a quick update: Red means deleted things (characters, lines of code or files) and green means added things. That's it, just check the name of the file at the beginning of each block and see the change applied to it.