Cannot determine size of image assets, cache problem

Hi,

This entry is similar to the following one from 2019, which is still pending: Unable to determine image size for

Podlove publisher, all of a sudden, cannot resize image assets (for every item). All items are present and can seperately be accessed by their appropriate URL.

[proxy_fcgi:error] [pid 11806] … AH01071: Got error 'PHP message: [2020-04-11 08:41:51] Podlove.WARNING: Unable to determine image size for /srv/www/radius.philo.at/html/wp-content/cache/podlove/6e/9e899385a0e1238472973e027431c4/sehen-horen-denken_original.

“…/cache/podlove” only contains thumbnail images for contributors, there are no other cached assets and no other cacheing plugins. I have tried all the define_cache options in wp-config.php, but to no avail. Disabling all additional plugins did not fix the problem.

Can anyone help? Thanks in advance,
h.h.

Here is the system report:

Website http://radius.philo.at
PHP Version 7.0.16-1~dotdeb+8.1
WordPress Version 5.3.2
WordPress Theme GeneratePress v2.4.1
Active Plugins
- ARVE Advanced Responsive Video Embedder v8.10.20
- Akismet Anti-Spam v4.1.4
- BuddyPress v5.1.2
- Category Tag Pages v1.0
- Classic Editor v1.5
- Column Shortcodes v1.0
- iframe popup v2.9
- iframe v4.5
- Maintenance Mode v5.4
- NewStatPress v1.3.2
- Podlove Podcast Publisher v2.9.10
- Podlove Web Player v2.1.0
- Recent Tweets Widget v1.6.8
- Shortcake (Shortcode UI) v0.7.4
- Shownotes v0.5.6
- SSH SFTP Updater Support v0.8.2
- WordPress phpinfo() v16.3
- WP-DBManager v2.80.3
- WP-Memory-Usage v1.2.2
- WP-ShowHide v1.04
- WP Twitter Feeds v1.5
WordPress Database Charset utf8
WordPress Database Collate
Publisher Version 2.9.10
Web Player Version player_v2
Twig Version 1.42.2
open_basedir ok
curl Version 7.38.0
iconv available
simplexml ok
max_execution_time 600
upload_max_filesize 1000M
memory_limit 50M
disable_classes
disable_functions pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,
permalinks ok (/%year%/%monthnum%/%day%/%postname%/)
podlove_permalinks ok
podcast_settings ok
web_player ok
podlove_cache on
assets

0 errors
0 notices
Nice, Everything looks fine!