Update faq.md

bih-cluster/docs/help/faq.md

@@ -597,6 +597,27 @@ slurmstepd: error: task[0] unable to set taskset '0x0'
 This is a minor failure related to Slurm and cgroups.
 Your job **should** run through successfully despite this error (that is more of a warning for end-users).
 
+## All of my R jobs crash!
+
+We are aware of an issue with running `R` from `conda-forge/r-base` when unexpected locales are used.
+We have seen users connecting from macOS to report these issues.
+You might see the following error:
+
+```
+Base R During startup - Warning message:
+Setting LC_CTYPE failed, using "C"
+*** caught segfault ***
+address (nil), cause 'memory not mapped'
+```
+
+You can try using `export LC_ALL=C` before starting R.
+If this resolves your problem, you can put the following lines into your `~/.bashrc` to persist this:
+
+```
+# Force setting "C" locale to prevent issues with locales.
+export LC_ALL=C
+```
+
 ## My login stalls / something weird is happening
 
 You can try to run `ssh -l USER hpc-login-1.cubi.bihealth.org bash -iv`.