So far, I've loaded C7.5 up a few times, have saved 3 test projects and had to force close C7.5 through task manager in W7 x64 almost every time I load the program due to the way it freezes without any warning.
In trying to use my 32bit plugins in Bitbridge (which is meant to be able to run these things), a frighteningly large number of plugins fail to load, crash C7.5 or appear with a GUI window that has no GUI. It is worth noting that the 64bit version of Sonar X3 runs all these plugins without any problem. Some examples of plugins that work in Sonar but don't work in Cubase:
Nomad Factory - some of them fail to load
Spectrasonics Atmosphere and Stylus
UAD-2 (Studer 800 so far- loaded but C7.5 froze when I clicked on a button)
I haven't finished testing all of them yet but some very important plugins in that list I cannot use in C7.
Did you try a Clean up & Defrag after installing the New versions of Cubase etc? The plug manufacturers should all have 64 bit versions of the plugins by now. They should at least have a support number or page where you could suggest they update.
Things are moving on. 64 bit has been out a while now . Likely if any plugin makers have not bothered to go 64 bit they're also dodgy on modern 32 bit Win 74/ 8 as well. What does Cubase behave like if you unload all the 3rd party suspects?
OP state that it doesn't' work with Cubase 7.5 x64. Its just obsolete and wrong information about all this plugins.
The truth is that the majority of all these plugins that he say doesn't work, work perfectly well with both Cubase 7.0.7 x64 and Cubase 7.5.10 x64, SONAR x64 editions of 8.5, X1, X2 and X3.
The plugins are available in X64bit for download for all legit buyers.
I have all NOMAD FACTORY plugins and they all work and are in full x64bit.
I have all Spectrasonics softwares all are in x64bit and all work without any issues in Cubase x64 and SONAR x64.
Stylus RMX are also in x64bit years ago work without any issues. Its also available as a "free" x64bit update for all legit buyers.
Atmosphere are updated years ago to Omnisphere that are in full x64bit too. Omnisphere are a much better virtual instrument then Atmosphere was.
UAD 2 are also in x64bit and are also official tested by UAD to work with latest Cubase versions.
Cakewalk Z3ta+ has been update to Z3TA+ 2 and are in full x64bit too. I have it and use it in Cubase 7.5.
I have all Cakewalks softwares all work in Cubase 7.5 x64 and all are in x64bit too.
I have Jbridge too work perfect with Cubase 7.5 x64
Native Instrument work too with Cubase x64. All included Kontakt 5 are all are in x64bit so you were saying?
Of course if you never update your plugins it will not work. Some x64 update are even free, "no charge" like Nomad Factory and Stylus RMX. So please don't say that you have not the founds to pay the small "fee" to update some of these plugins to x64 later versions. Obviously you do because you just bought Cubase 7.5 and have UAD2 that cost 10x times more then update these softwares to latest version of these plugins. Jbridge coast a fraction.
Now we have set the information straight. Now you all can continue the "rants and moans" about how Cubase 7.5 x64 sucks.