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I can assure you that, other then WRITE_ENABLE_FIBRE_REG(0), there are no assignments outside this process.
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This will be the reason why it wasnt working.
When you use a loop, the compiler does not know which bits are set and which are not, so when you assign even 1 bit inside the loop, it assumes all the bits are driven in the process. This leads to a multiple driver error on any bits assigned outside the process. This is just how VHDL works and NOT and error with the compiler.
moral of the story - if you use a loop, you MUST assign ALL bits for that signal inside the process. This is why your temporary version works, as you do assign WRITE_ENABLE_FIBRE_REG_TEST inside the loop.
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