After hours of tinkering i got it!!!
It was the Retroachievements!
With the update of Retroarch 1.9.7 -> 1.10.0 the PSP-Support for Achievements has been introduced to the Raspberry Pi.
And RA also changed another thing: the Achievements start in "Hardcore-Mode" by default now.
In Hardcore-Mode special rules have to be followed, i.e. Save-States are not allowed.
I dont know what excatly happened, but i guess that somehow these mechanisms do affect the general in-game-saving-ability of lr-ppsspp.
Once i deactivated the Hardcore-Mode all games save fine again!
And i also found out why i seem to be the only one affected: on the RetroAchievements-Website i realized that not many people use PSP-Achievements at the moment: "12 of 28 possible Users got the Achievement".
OK, 28 users in total, so i might be the only one using a Raspberry Pi and lr-ppsspp there
It was the Retroachievements!
With the update of Retroarch 1.9.7 -> 1.10.0 the PSP-Support for Achievements has been introduced to the Raspberry Pi.
And RA also changed another thing: the Achievements start in "Hardcore-Mode" by default now.
In Hardcore-Mode special rules have to be followed, i.e. Save-States are not allowed.
I dont know what excatly happened, but i guess that somehow these mechanisms do affect the general in-game-saving-ability of lr-ppsspp.
Once i deactivated the Hardcore-Mode all games save fine again!
And i also found out why i seem to be the only one affected: on the RetroAchievements-Website i realized that not many people use PSP-Achievements at the moment: "12 of 28 possible Users got the Achievement".
OK, 28 users in total, so i might be the only one using a Raspberry Pi and lr-ppsspp there