diff --git a/doc/changes/devel/12612.bugfix.rst b/doc/changes/devel/12612.bugfix.rst
new file mode 100644
index 00000000000..5868fb93a2a
--- /dev/null
+++ b/doc/changes/devel/12612.bugfix.rst
@@ -0,0 +1 @@
+Fix overflow when plotting source estimates where data is all zero (or close to zero), and fix the range of allowed values for the colorbar sliders, by `Marijn van Vliet`_.
diff --git a/mne/viz/_brain/_brain.py b/mne/viz/_brain/_brain.py
index 8c891969ad8..1832c1b74ff 100644
--- a/mne/viz/_brain/_brain.py
+++ b/mne/viz/_brain/_brain.py
@@ -869,8 +869,8 @@ def set_orientation(value, orientation_data=orientation_data):
         )
 
     def _configure_dock_colormap_widget(self, name):
-        fmin, fmax, fscale, fscale_power = _get_range(self)
-        rng = [fmin * fscale, fmax * fscale]
+        fmax, fscale, fscale_power = _get_range(self)
+        rng = [0, fmax * fscale]
         self._data["fscale"] = fscale
 
         layout = self._renderer._dock_add_group_box(name)
@@ -4157,16 +4157,15 @@ def _get_range(brain):
     multiplied by the scaling factor and when getting a value, this value
     should be divided by the scaling factor.
     """
-    val = np.abs(np.concatenate(list(brain._current_act_data.values())))
-    fmin, fmax = np.min(val), np.max(val)
+    fmax = brain._data["fmax"]
     if 1e-02 <= fmax <= 1e02:
         fscale_power = 0
     else:
-        fscale_power = int(np.log10(fmax))
+        fscale_power = int(np.log10(max(fmax, np.finfo("float32").min)))
         if fscale_power < 0:
             fscale_power -= 1
     fscale = 10**-fscale_power
-    return fmin, fmax, fscale, fscale_power
+    return fmax, fscale, fscale_power
 
 
 class _FakeIren:
diff --git a/tools/install_pre_requirements.sh b/tools/install_pre_requirements.sh
index 280c5f60867..ac90a38612c 100755
--- a/tools/install_pre_requirements.sh
+++ b/tools/install_pre_requirements.sh
@@ -67,7 +67,9 @@ echo "joblib"
 pip install $STD_ARGS git+https://github.com/joblib/joblib
 
 echo "edfio"
-pip install $STD_ARGS git+https://github.com/the-siesta-group/edfio
+# Disable protection for Azure, see
+# https://github.com/mne-tools/mne-python/pull/12609#issuecomment-2115639369
+GIT_CLONE_PROTECTION_ACTIVE=false pip install $STD_ARGS git+https://github.com/the-siesta-group/edfio
 
 if [[ "${PLATFORM}" == "Linux" ]]; then
 	echo "h5io"
diff --git a/tutorials/time-freq/50_ssvep.py b/tutorials/time-freq/50_ssvep.py
index 706841fefac..96a2bf39ca8 100644
--- a/tutorials/time-freq/50_ssvep.py
+++ b/tutorials/time-freq/50_ssvep.py
@@ -641,7 +641,7 @@ def snr_spectrum(psd, noise_n_neighbor_freqs=1, noise_skip_neighbor_freqs=1):
     ].mean(axis=1)
 
 fig, ax = plt.subplots(1)
-ax.boxplot(window_snrs, labels=window_lengths, vert=True)
+ax.boxplot(window_snrs, tick_labels=window_lengths, vert=True)
 ax.set(
     title="Effect of trial duration on 12 Hz SNR",
     ylabel="Average SNR",