Thanks for your analysis of this problem. I’ve been using PSPad for years and have kept up with the updates. After updating to 5.0.6, PSPad became so unstable as to be unusable. Several times a day I’d get that rogue “ÿ” character often followed by other unwanted characters mysteriously appearing in files. I’ve tried several adjustments to settings (shooting in the dark) but nothing works. I’ve reverted to version 5.0.4 (543) 32 bit for now. There are many alternatives editor but none suits me like PSPad, when it’s working properly. Kudos to Jan Fiala at. al. for such a well thought out design. But please, make it work.
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